Pith Number

pith:IRDOYT7Z

pith:2026:IRDOYT7ZWNINM6XYNMJH62ZOAV

not attested not anchored not stored refs pending

Direct Methods for Calculating PseudoInverses

Jeff Knisley

arxiv:2607.10302 v1 · 2026-07-11 · math.NA · cs.NA

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{IRDOYT7ZWNINM6XYNMJH62ZOAV}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-07-14T01:21:08.356564Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

4446ec4ff9b350d67af86b127f6b2e0561eebae1327976998c6476078dd92bbd

Aliases

arxiv: 2607.10302 · arxiv_version: 2607.10302v1 · doi: 10.48550/arxiv.2607.10302 · pith_short_12: IRDOYT7ZWNIN · pith_short_16: IRDOYT7ZWNINM6XY · pith_short_8: IRDOYT7Z

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/IRDOYT7ZWNINM6XYNMJH62ZOAV \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 4446ec4ff9b350d67af86b127f6b2e0561eebae1327976998c6476078dd92bbd

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "850b1050f9bb76c20d5fb894eaab2c4fbaa8092dc3806b7e6e8f1332172d324c",
    "cross_cats_sorted": [
      "cs.NA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "math.NA",
    "submitted_at": "2026-07-11T13:14:17Z",
    "title_canon_sha256": "3ff5c733882ae66b4fad182f87ad76ae32061210092062f6c67a921c010795cf"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2607.10302",
    "kind": "arxiv",
    "version": 1
  }
}